Question

Agora calcule:
a) (2x + y)2 =
b) (3x - 2y)2 =
c) ( 9x + 5)(9x – 5)=

Answer 1

Resposta:

Olá! <3

Explicação passo-a-passo:

a) (2x + y) 2 =

(2x)² + 2.(2x).(y) + (y)²

4x² + 4xy + y²

b) (3x - 2y) 2 =

(3x - 2y).(3x - 2y)

= 9x² - 6xy - 6xy + 4y²

9x² - 12xy + 4y²

c) ( 9x + 5)(9x – 5)= 81x² - 25